I don't know why stargate does not have the faster then light travel. The Pegasus galaxy is roughly 3 million light years way and it takes the deadalus 6 weeks to travel it. But unless it was in subspace where the laws of physics does not apply. In Firefly and stargate they also fail to include the Theory of Relativity because what would seem like 6 weeks for them would be like 2 years for us.